Every hardware engineer is familiar with traditional design review. In the past, it made sense to gather a group of people in a room, staring at a projector screen, and manually walk through the schematics and PCB layout. Every person has a chance to voice their input and create action items.
Revision control has made huge strides in the past 15 years. File repos no longer need dedicated IT employees to set up and maintain servers. Numerous providers offer turnkey solutions for revision control. The most popular and functional tool has been the git.